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In 2017, Guttmacher reported that almost 25% of women will have had an abortion by age 45, with 4.6% of 20-year-olds and 19% of 30-year-olds having had at least one. [14] More than six million women in the United States, or 11 percent of women of reproductive age, become pregnant each year.
The average age of a girl's first period is 12 to 13 (12.5 years in the United States, [6] 12.72 in Canada, [7] 12.9 in the UK [8]) but, in postmenarchal girls, about 80% of the cycles are anovulatory in the first year after menarche, which declines to 50% in the third year, and to 10% by the sixth. [9]
In 2013, the teenage birth rate in the United States reached a historic low: 26.6 births per 1,000 women aged 15–19. [24] More than three-quarters of these births are to women aged 18 or 19. [ 24 ] In 2005 in the U.S., 57% of teen pregnancies resulted in a live birth, 27% ended in an induced abortion, and 16% in a fetal loss.
For the first time in nearly a decade, the birth rate among U.S. women is on the rise. According to a Department of Health and Human Services study, the birth rate among women 15 to 44 increased ...
Triplet and higher multiple births nosedive. In 2004, of the people younger than 35 who gave birth with the help of IVF, 32.7% delivered twins, and 4.9% delivered triplets, according to doctors at ...
Multiple studies have indicated a strong link between early childhood sexual abuse and subsequent teenage pregnancy in industrialized countries. Up to 70% of women who gave birth in their teens were molested as young girls. By contrast, 25% of women who did not give birth as teens were molested. [90] [91] [92]
The mean age at childbearing indicates the age of a woman at their childbearing events, if women were subject throughout their lives to the age-specific fertility rates observed in that given year. [1] In countries with very high fertility rates women can have their first child at a much younger age than the mean age at childbearing.
Replacement fertility is the total fertility rate at which women give birth to enough babies to sustain population levels, assuming that mortality rates remain constant and net migration is zero. [8] If replacement level fertility is sustained over a sufficiently long period, each generation will exactly replace itself. [8]